Abstract: Hearing aid or audio device having a behind the ear part adapted to rest behind an earlobe of a user and a speaker unit comprising a speaker, whereby the speaker unit is adapted for insertion into the ear of a user, and whereby electric leads are provided between the speaker unit and the behind the ear part, said leads having a connection part opposite the speaker unit for connection with a corresponding socket in the behind the ear part, wherein the exterior and visible parts of the behind the ear part are defined by a generally U-shaped shell element, a battery drawer and a microphone cover plate characterized in that all further inside parts of the behind the ear part are interconnected to form a single sub-assembly and in that said sub-assembly is releasably coupled to the U-shaped shell element between two upright walls thereof by latch-locks provided to interact between the microphone cover plate and the upright wall elements

Abstract: A method for preserving a mechanical alignment of a semiconductor laser (100) by use of a temperature control system (101). The semiconductor laser includes an optical mount (110) for mounting a semiconductor laser diode (131) and optical components (132,133). A thermal device (140) and a temperature sensor (180) are used for heating or cooling the optical mount and the semiconductor laser. The method includes adjusting the temperature of the semiconductor laser at a rate less than a predetermined temperature rate by use of the thermal device so as to minimise temperature-related faults, wherein the predetermined temperature rate is experimentally determined and is adapted to the semiconductor laser.